hasPath(path) returns null in case path not found, instead of InvalidPathException. Tests changed accordingly.

json-path/src/main/java/com/jayway/jsonpath/JsonModel.java

@@ -154,13 +154,13 @@ public class JsonModel {
     public boolean hasPath(JsonPath jsonPath){
 
         isTrue(jsonPath.isPathDefinite(), "hasPath can only be used for definite paths");
-
+        Object obj = null;
         try {
-            get(jsonPath);
+            obj = get(jsonPath);
         } catch(InvalidPathException e){
             return false;
         }
-        return true;
+        return null == obj?false:true;
     }
 
     // --------------------------------------------------------

json-path/src/main/java/com/jayway/jsonpath/internal/filter/FieldFilter.java

@@ -55,8 +55,8 @@ public class FieldFilter extends PathTokenFilter {
             }
         } else {
             Map<String, Object> map = jsonProvider.toMap(obj);
-            if(!map.containsKey(condition)){
-                throw new InvalidPathException("invalid path");
+            if(map == null || !map.containsKey(condition)){
+                return null;
             } else {
                 return map.get(condition);
             }

json-path/src/test/java/com/jayway/jsonpath/JsonModelTest.java

@@ -56,6 +56,9 @@ public class JsonModelTest {
                     "  }\n" +
                     "}";
 
+    public final static String INVALID_DOCUMENT =
+            "{?\\?\\?!!?~q`}}}}}\"\" \"store\": {\n";
+
 
     @Test
     public void a_model_can_be_pretty_printed() throws Exception {
@@ -101,9 +104,14 @@ public class JsonModelTest {
     }
 
 
+    @Test(expected = InvalidJsonException.class)
+    public void invalid_json_throws() throws Exception {
+        JsonModel.model(INVALID_DOCUMENT).get("store.id");
+    }
+
     @Test(expected = InvalidPathException.class)
     public void invalid_path_throws() throws Exception {
-        JsonModel.model(DOCUMENT).get("store.invalid");
+        JsonModel.model(DOCUMENT).get("a(");
     }